error: api.mydomain.com already exists in stack arn:aws:xyz

[mdesousa]

Create two stacks with 2 instances of ApiGatewayToLambda()

In the first instance, configure a domain name like this:

apiGatewayProps: { domainName: { domainName: 'api.mydomain.com', certificate: { certificateArn } }

The second instance should be on the same domain name, but on a different path:

apiGatewayProps: { domainName: { domainName: 'api.mydomain.com', basePath: 'mypath', certificate: { certificateArn } }

This should be supported since api gateway supports having a domain with mappings to multiple APIs.
Instead, we get an error when the second stack is being deployed: "api.mydomain.com already exists in stack arn:aws:xyz"

Thanks!

[biffgaut]

Thanks - we'll take a look.

[biffgaut]

This appears to be a limitation at the CDK level. This code attempts to launch 2 RestAPIs with the same domain name using just CDK L2 constructs and sees the same behavior.

export class Issue1028Stack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    const functionOne = new lambda.Function(this, 'function-one',
    {
       code: lambda.Code.fromAsset(`lambda`),
       runtime: lambda.Runtime.NODEJS_18_X,
       handler: 'indexOne.handler',
    })

    const myCert = cert.Certificate.fromCertificateArn(this, 'fake-cert', 'real cert arn omitted');
    const propsOne: api.RestApiProps = {
      domainName: { 
        domainName: 'testdomain.net',
        certificate:myCert
      }
    }
    const apiOne = new api.RestApi(this, 'one', propsOne);
    apiOne.root.addMethod('GET', new api.LambdaIntegration(functionOne));


    const functionTwo = new lambda.Function(this, 'function-two',
    {
       code: lambda.Code.fromAsset(`lambda`),
       runtime: lambda.Runtime.NODEJS_18_X,
       handler: 'indexTwo.handler',
    })

    const propsTwo: api.RestApiProps = {
      domainName: { 
        domainName: 'testdomain.net',
        certificate:myCert,
        basePath: 'subSite'
      }
    }
    const apiTwo = new api.RestApi(this, 'two', propsTwo);
    apiTwo.root.addMethod('GET', new api.LambdaIntegration(functionTwo));
  }
}